Well, David, I choose to use tansformers in my solid state phantom powered circuits. They are not as high ratio as some of the early deigns though.

I apologize if you build a product that I'm unfamiliar with and it uses an internal switchmode psu. I was referring to some modern mics from Berlin. If you aren't building commercial mics, I'm not sure how I would be expected to know anything about them. I'm also a little confused by sentence "They are not as high ratio as some of the early deigns though.", what, or whose early designs? Why is ratio relevant?thanks,David